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Need explaination for a function please

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linux-howto

http://www.unix.com – can anybody explain a long fpathconf(int fildes, int name); what it do like 1- lim = fpathconf(STDIN_FILENO, _PC_NAME_MAX); printf("%s %ld\n", "_PC_NAME_MAX: ", lim); 2- lim = fpathconf(STDIN_FILENO, _PC_PATH_MAX); printf("%s %ld\n", " _PC_PATH_MAX ", lim); 3- lim = fpathconf(STDIN_FILENO, _PC_PIPE_BUF); printf("%s %ld\n", "_PC_PIPE_BUF: ", lim); with easy language please cuz I have already an explanation with hard one :D (HowTos)